Modulating laser intensity in a laser printer proportionately to

Details Modulating laser intensity in a laser printer proportionately to Modulating laser intensity in a laser printer proportionately to

1987-11-30

1989-05-30

Goldberg, E. A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346108, 346160, 354 4, 354 5, G01D 900, G01D 942

Patent

active

048355453

ABSTRACT:
A photosensitive, photoconductive media moving in a first direction relative to a laser light beam scanning in a second direction, transverse to the first direction, incurs velocity variations. These velocity variations result in variations in the absolute and relative heights of white and black image features. This printed image nonuniformity is especially visually detectable for closely spaced parallel lines in the second direction, and/or gray scale. An optical velocity sensor senses instantaneous media velocity. An analog or digital velocity error processor maintains a running average velocity and determines, by subtraction, an instantaneous velocity error as the difference between currently sensed and running average velocities. The instantaneous velocity error so determined is used to adjust the intensity of the laser light beam to be proportionally brighter (dimmer), exposing a wider (narrower) scan line, on a faster-moving (slower-moving) media region. By this compensating, the ratio of white and black image features is maintained constant during media velocity variations.

REFERENCES:
patent: 4422083 (1983-12-01), Neumann
patent: 4551732 (1985-11-01), Rogers

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